Core structure for dynamo-electric machines.



G. B. MILL 001m STRUCTURE FOR DYNAMO B RIG MACHINES.

APPLICATION FILED MAY 9 191 1.

1,046,834, Patented Dec. 10, 1912.

'INVENTOR mmuw -- AiTORNEY V UNITED STATES PATENT oEEIoE.

CHESTER E, MILLS, OF

HOUSE ELECTRIC AND vANIA.

vented a new and useful Improvement in Core Structures forDynamo-Electric Ma-- chines, of which the following is a specifica tion.

My invention relates to the core structures dynamo'electric machines,and particularlyto means for securing such structures to shaft-s orother rotatable or supporting members.

The object of my invention is to provide simple and inexpensive meanswhereby a laminated core member may be effectively secured'upon a shaftor other support which shall be particularly useful when the core memberis provided with peripheral slots for conductors extending across thesame at angles to their axes, though the invention is susceptible ofmore extended applica-. tion.

Figure 1 of the accompanying drawing is a view, in side elevation,of'the secondary member of an induction motor constructed in accordancewith my invention, a portion thereof being broken away for the sake ofillustration, and Fig. 2 is an enlarged end and sectional view of a partof the member shown in Fig. 1.

The member shown comprises a shaft 1 having an intermediate roughened,knurled or ribbed portion 2 that may be conveniently formed by means ofa nurling tool. While the surface of the shaft may have any suitableconfiguration, it preferably conslsts of a plurality of clearness ofribs.

Mounted upon the roughened intermediate portion of the shaft, is thecore memher 3, which consists of a suitable number of plates or laminaethat are clamped togetherbetween end members 4 and are provided withlongitudinal peripheral slots 5 for the reception of conducting bars 6the ends of which are upset or headed against he end plates and makegood electrical coniection therewith. The member is thus idapted to beused as the secondary member if an' induction motor. It will beundertood, however, that the invention is not imited to such specificapplication but may GORE STRUCTURE FOR DYNAMO-EBECTRIC Specification ofLetters Patent. Application filed May 9, 1911.

CHESTER B MILLS, a

and to its axis.

this intermediate portion of very small, closely adjacent longitudinalEAs'r McxEEsroET, PENNSYLVANIA, ASSIGNOR TO wEs'rINo- MANUFACTURINGCOMPANY, A CORPORATION oErENNsYL- MACHINES.

Patented Dec. 10,1912.

Serial No. 626,112.

be employed, also, in the manufacture of dlrec-t current desirable tosecure a plurality. of plates or punchings upon a shaft or othersupport. The-core member is applied to the. shaft by pressure and thethus caused to closely engage the roughened or knurled portion of theshaft and to embed or partially seat themselves in the recesses betweenthe ribs or other projections; If the roughened port-ion of the shaftconsists of longitudinal ribs, there is less liability of tearing orotherwise injuring the plates or laminae when applying the core to theshaft and a more secure mountingv is thus obtained.

The invention is particularly useful when the peripheral core slotsextend at angles core member, since 'it ohv1ates,.-in any case, thenecessity of providing the core member and the shaft with keyways forthe reception of keys, as has heretofore been .customary. When suchkeyways have been provided in the core 'memher by punching out smallportions of the plates, the skewing of the core slots necessitated theemployment of a skewed key-way in the shaft, which is entirelyimpractical when the shafts are of small diameter. The key-ways have,accordingly, usually been made in the core member after assembling ofits plates in order that the same be par- This has required extra laborand material and has resulted in a much more-expensive structure thanthe one herein set forth.

I claim as my invention: v 1. The combination with a shaft a knurledportion, of a core member comprising a plurality of plates mounted uponthe knurled portionof the shaft and making a close self adjusting fittherewith.

2. The combination to the axis of the member comprising a plurality ofplates mounted upon the knurled portion of the shaft and making a closeself adjusting fit therewith.

3. The combination with a shaft having a large number .of thin shallowribs extending longitudinally thereof, of a core mhmber comprising aplurality of plates mounted upon the ribbed portion of the shaft andadjusting fit therewith.

making a close self with a shaft' having a 4. The combination armaturesor wherever it is c .60 plates or laminae are having 7 witha shafthaving a longitudinally knurled portion, of a core adjusting fittherewith, the core member:- having peripheral slots extending acrossthe same at angles to its'axis. s

c In testimony whereof, I have hereunto 15 subscribed my nam this. 24thday of April, 1911. V

CHESTER, B. MILLS.

Witnesses STANLEY STROUD,

